June 9, 1993: NASA's Hubble Space Telescope (HST) has discovered a new population of stars
isolated deep in the core of M15, one of the densest globular star clusters.
The stars are among the hottest stars observed in the core of a globular cluster. The
most likely explanation for their existence is that they are the "naked cores" of stars
that have been stripped of their outer envelope of gas, according to astronomers.